铜陵舒家店地区中生代中酸性侵入岩锆石Hf同位素特征及其地质意义

李名则; 吴才来; 吴迪; 雷敏; 王楠

doi:10.3799/dqkx.2020.043

Volume 45 Issue 7

Jul. 2020

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Article Navigation > Earth Science > 2020 > 45(7): 2555-2570

Li Mingze, Wu Cailai, Wu Di, Lei Min, Wang Nan, 2020. Geochemical and Zircon Hf Isotopic Characteristics of Mesozoic Intermediate-Acid Intrusive Rocks in Shujiadian Area, Tongling and Their Geological Significance. Earth Science, 45(7): 2555-2570. doi: 10.3799/dqkx.2020.043

Citation:

Li Mingze, Wu Cailai, Wu Di, Lei Min, Wang Nan, 2020. Geochemical and Zircon Hf Isotopic Characteristics of Mesozoic Intermediate-Acid Intrusive Rocks in Shujiadian Area, Tongling and Their Geological Significance. Earth Science, 45(7): 2555-2570. doi: 10.3799/dqkx.2020.043

Citation:

Li Mingze, Wu Cailai, Wu Di, Lei Min, Wang Nan, 2020. Geochemical and Zircon Hf Isotopic Characteristics of Mesozoic Intermediate-Acid Intrusive Rocks in Shujiadian Area, Tongling and Their Geological Significance. Earth Science, 45(7): 2555-2570. doi: 10.3799/dqkx.2020.043

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Geochemical and Zircon Hf Isotopic Characteristics of Mesozoic Intermediate-Acid Intrusive Rocks in Shujiadian Area, Tongling and Their Geological Significance

doi: 10.3799/dqkx.2020.043

Li Mingze^1
,,
Wu Cailai^{2
,
,},
Wu Di³,
Lei Min²,
Wang Nan⁴

1.
Sichuan Geological Survey, Chengdu 610081, China
2.
Institute of Geology, CAGS, Beijing 100037, China
3.
Institute of Geomechanics, CAGS, Beijing 100081, China
4.
Institute of Mineral Resources, CAGS, Beijing 100037, China

Received Date: 2020-03-10
Publish Date: 2020-07-15

Abstract

Abstract

In this paper, we carry out research on intermediate-acid intrusive rocks in Shujiadian area in aspect of zircon LA-MC-ICP-MS Lu-Hf isotopes combining previous geochemical data. The characteristics of major and trace elements show that the rocks belong to metaluminous series with attributes of island arc magmatic rocks, and may have experienced assimilation-fractional crystallization (AFC) process. We considered that the Early Cretaceous magmatic activity might relate to the oblique subduction of the Pacific plate in the beginning of the Cretaceous, and the evolution of the intrusive rocks in the area were subject to the regional tectonic stress field. The Hf isotope analysis shows that except two inherited zircon cores, the ε_Hf(t) values are negative, with shoshonite series being -8.6 to -4.1 and High-K calc-alkaline series -13.4 to -4.7. Comparing to the high-K calc-alkaline series rocks, the ε_Hf(t) values of the shoshonite series are closer to chondrite evolution line. Considering from the variance of ε_Hf(t) values for the two series, though they both originated from enriched mantle and were contaminated with crustal material during magmatic evolution, the high-K series was contaminated more during this process.
- Shujiadian,
- geochemistry,
- zircon Hf isotope,
- tectonic setting,
- material source

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